Contrary to our results, previous studies claim that emission from the
hard X-ray point source in IZw18 may be significant for its Heii
ionization [1]}, [2]}, [3]}. [1]} and
[2]}, however, do not consider the nebular Heii budget
in their modeling, which is key to studying the origin of the bulk of
the Heii ionizing photons [6]}. On the other hand, [3]} assume that the
nebular Heii emission in IZw18 is fully ionized by its HMXB,
this way overlooking the energy-dependent cross section of He\(^+\) 
which must be considered for the estimation of the intrinsic X-ray
ionizing power (see above). Moreover, these works do not
take into consideration the distinct spatial locations of the X-ray
and the Heii emissions in IZw18 unveiled here.
